Characteristic low-temperature crystallization of amorphous mg-bearing silicate grains y under electron irradiation

Yuki Kimura, Yu Miyazaki, Akihito Kumamoto, Midori Saito, Chihiro Kaito

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Amorphous Mg-bearing silicate grains, which were produced by the coalescence between MgO and SiOx smoke particles, were crystallized to forsterite (Mg2SiO4) by electron-beam irradiation in a transmission electron microscope at room temperature. The crystallization induced by electron beams was accelerated by the presence of CH4 adsorbed on the surface and incorporated interior of the grains. This experimental result implies the possibility of low-temperature crystallization in a silicate carbon star. In the case of binary stars, since the materials that flow from the stars stationarily exist around the star, the formed amorphous silicate grains will be irradiated by electrons from the star for a long duration. As a result, a significant amount of crystalline silicates can be produced.

Original languageEnglish
Pages (from-to)L89-L92
JournalAstrophysical Journal
Volume680
Issue number1 PART 2
DOIs
Publication statusPublished - 2008

Keywords

  • AGB
  • Comets: General
  • Methods: Laboratory
  • Stars: Agb and post

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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